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![Christoph Hellwig](/assets/img/avatar_default.png)
And ensure it works for RT subvolume files an set the block device, both of which will be needed to be able to use the function in the buffered write path. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
306 lines
7.3 KiB
C
306 lines
7.3 KiB
C
/*
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* Copyright (c) 2014 Christoph Hellwig.
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*/
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#include <linux/iomap.h>
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#include "xfs.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_log.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_error.h"
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#include "xfs_iomap.h"
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#include "xfs_shared.h"
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#include "xfs_bit.h"
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#include "xfs_pnfs.h"
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/*
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* Ensure that we do not have any outstanding pNFS layouts that can be used by
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* clients to directly read from or write to this inode. This must be called
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* before every operation that can remove blocks from the extent map.
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* Additionally we call it during the write operation, where aren't concerned
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* about exposing unallocated blocks but just want to provide basic
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* synchronization between a local writer and pNFS clients. mmap writes would
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* also benefit from this sort of synchronization, but due to the tricky locking
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* rules in the page fault path we don't bother.
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*/
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int
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xfs_break_layouts(
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struct inode *inode,
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uint *iolock,
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bool with_imutex)
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{
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struct xfs_inode *ip = XFS_I(inode);
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int error;
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ASSERT(xfs_isilocked(ip, XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL));
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while ((error = break_layout(inode, false) == -EWOULDBLOCK)) {
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xfs_iunlock(ip, *iolock);
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if (with_imutex && (*iolock & XFS_IOLOCK_EXCL))
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inode_unlock(inode);
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error = break_layout(inode, true);
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*iolock = XFS_IOLOCK_EXCL;
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if (with_imutex)
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inode_lock(inode);
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xfs_ilock(ip, *iolock);
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}
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return error;
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}
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/*
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* Get a unique ID including its location so that the client can identify
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* the exported device.
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*/
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int
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xfs_fs_get_uuid(
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struct super_block *sb,
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u8 *buf,
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u32 *len,
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u64 *offset)
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{
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struct xfs_mount *mp = XFS_M(sb);
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printk_once(KERN_NOTICE
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"XFS (%s): using experimental pNFS feature, use at your own risk!\n",
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mp->m_fsname);
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if (*len < sizeof(uuid_t))
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return -EINVAL;
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memcpy(buf, &mp->m_sb.sb_uuid, sizeof(uuid_t));
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*len = sizeof(uuid_t);
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*offset = offsetof(struct xfs_dsb, sb_uuid);
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return 0;
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}
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/*
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* Get a layout for the pNFS client.
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*/
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int
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xfs_fs_map_blocks(
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struct inode *inode,
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loff_t offset,
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u64 length,
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struct iomap *iomap,
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bool write,
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u32 *device_generation)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_bmbt_irec imap;
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xfs_fileoff_t offset_fsb, end_fsb;
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loff_t limit;
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int bmapi_flags = XFS_BMAPI_ENTIRE;
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int nimaps = 1;
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uint lock_flags;
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int error = 0;
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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/*
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* We can't export inodes residing on the realtime device. The realtime
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* device doesn't have a UUID to identify it, so the client has no way
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* to find it.
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*/
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if (XFS_IS_REALTIME_INODE(ip))
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return -ENXIO;
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/*
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* Lock out any other I/O before we flush and invalidate the pagecache,
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* and then hand out a layout to the remote system. This is very
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* similar to direct I/O, except that the synchronization is much more
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* complicated. See the comment near xfs_break_layouts for a detailed
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* explanation.
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*/
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xfs_ilock(ip, XFS_IOLOCK_EXCL);
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error = -EINVAL;
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limit = mp->m_super->s_maxbytes;
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if (!write)
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limit = max(limit, round_up(i_size_read(inode),
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inode->i_sb->s_blocksize));
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if (offset > limit)
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goto out_unlock;
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if (offset > limit - length)
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length = limit - offset;
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error = filemap_write_and_wait(inode->i_mapping);
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if (error)
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goto out_unlock;
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error = invalidate_inode_pages2(inode->i_mapping);
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if (WARN_ON_ONCE(error))
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return error;
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end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + length);
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offset_fsb = XFS_B_TO_FSBT(mp, offset);
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lock_flags = xfs_ilock_data_map_shared(ip);
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error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
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&imap, &nimaps, bmapi_flags);
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xfs_iunlock(ip, lock_flags);
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if (error)
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goto out_unlock;
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if (write) {
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enum xfs_prealloc_flags flags = 0;
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ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
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if (!nimaps || imap.br_startblock == HOLESTARTBLOCK) {
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/*
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* xfs_iomap_write_direct() expects to take ownership of
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* the shared ilock.
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*/
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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error = xfs_iomap_write_direct(ip, offset, length,
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&imap, nimaps);
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if (error)
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goto out_unlock;
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/*
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* Ensure the next transaction is committed
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* synchronously so that the blocks allocated and
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* handed out to the client are guaranteed to be
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* present even after a server crash.
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*/
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flags |= XFS_PREALLOC_SET | XFS_PREALLOC_SYNC;
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}
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error = xfs_update_prealloc_flags(ip, flags);
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if (error)
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goto out_unlock;
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}
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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xfs_bmbt_to_iomap(ip, iomap, &imap);
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*device_generation = mp->m_generation;
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return error;
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out_unlock:
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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return error;
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}
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/*
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* Ensure the size update falls into a valid allocated block.
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*/
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static int
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xfs_pnfs_validate_isize(
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struct xfs_inode *ip,
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xfs_off_t isize)
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{
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struct xfs_bmbt_irec imap;
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int nimaps = 1;
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int error = 0;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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error = xfs_bmapi_read(ip, XFS_B_TO_FSBT(ip->i_mount, isize - 1), 1,
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&imap, &nimaps, 0);
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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if (error)
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return error;
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if (imap.br_startblock == HOLESTARTBLOCK ||
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imap.br_startblock == DELAYSTARTBLOCK ||
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imap.br_state == XFS_EXT_UNWRITTEN)
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return -EIO;
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return 0;
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}
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/*
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* Make sure the blocks described by maps are stable on disk. This includes
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* converting any unwritten extents, flushing the disk cache and updating the
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* time stamps.
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*
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* Note that we rely on the caller to always send us a timestamp update so that
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* we always commit a transaction here. If that stops being true we will have
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* to manually flush the cache here similar to what the fsync code path does
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* for datasyncs on files that have no dirty metadata.
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*/
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int
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xfs_fs_commit_blocks(
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struct inode *inode,
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struct iomap *maps,
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int nr_maps,
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struct iattr *iattr)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_trans *tp;
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bool update_isize = false;
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int error, i;
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loff_t size;
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ASSERT(iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME));
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xfs_ilock(ip, XFS_IOLOCK_EXCL);
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size = i_size_read(inode);
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if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size > size) {
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update_isize = true;
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size = iattr->ia_size;
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}
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for (i = 0; i < nr_maps; i++) {
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u64 start, length, end;
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start = maps[i].offset;
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if (start > size)
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continue;
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end = start + maps[i].length;
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if (end > size)
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end = size;
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length = end - start;
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if (!length)
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continue;
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/*
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* Make sure reads through the pagecache see the new data.
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*/
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error = invalidate_inode_pages2_range(inode->i_mapping,
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start >> PAGE_SHIFT,
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(end - 1) >> PAGE_SHIFT);
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WARN_ON_ONCE(error);
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error = xfs_iomap_write_unwritten(ip, start, length);
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if (error)
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goto out_drop_iolock;
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}
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if (update_isize) {
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error = xfs_pnfs_validate_isize(ip, size);
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if (error)
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goto out_drop_iolock;
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}
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
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if (error)
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goto out_drop_iolock;
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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xfs_setattr_time(ip, iattr);
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if (update_isize) {
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i_size_write(inode, iattr->ia_size);
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ip->i_d.di_size = iattr->ia_size;
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}
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xfs_trans_set_sync(tp);
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error = xfs_trans_commit(tp);
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out_drop_iolock:
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xfs_iunlock(ip, XFS_IOLOCK_EXCL);
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return error;
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}
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